1. Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll Straße 8, D-07745 Jena, Germany
2. Laboratory for Bioanalytical Chemistry, Institute of Chemistry, University of Neuchâtel, Avenue de Bellevaux 51, CH-2000 Neuchâtel, Switzerland
3. Research Group Biosynthesis/NMR, Max Planck Institute for Chemical Ecology, Hans-Knöll Straße 8, D-07745 Jena, Germany
4. Neuchâtel Platform for Analytical Chemistry (NPAC), University of Neuchâtel, Avenue de Bellevaux 51, CH-2000 Neuchâtel, Switzerland